500
"Abu Umaamah reported the The Messenger of Allah (peace be upon him ) said: " The number of Prophets (that existed) is 124,000. From this number, the Messengers are ________ a very large number."
"Three hundred & fifteen.
[Recorded by Ahmad, Ibn Hiban, at-Tabaraani, & others. Authenticated by al-Albaani (as-Saheehah no.2668)"